I have a Rev L TIU that will not light up. I am using an external power source. Due to expansion I had to move all of the wires . It worked prior to the move. It is not the power source because I have a second TIU that works. I swapped the power source and the first TIU still does not work.It is possible that when I initially reconnected the TIUs I had the polarity from the power source reversed. Would that cause the TIU to die? What should I check?
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